EP2389577A1 - Systeme d'imagerie par balayage d'une surface d'un echantillon, support et dispositif de lecture correspondants - Google Patents
Systeme d'imagerie par balayage d'une surface d'un echantillon, support et dispositif de lecture correspondantsInfo
- Publication number
- EP2389577A1 EP2389577A1 EP10701665A EP10701665A EP2389577A1 EP 2389577 A1 EP2389577 A1 EP 2389577A1 EP 10701665 A EP10701665 A EP 10701665A EP 10701665 A EP10701665 A EP 10701665A EP 2389577 A1 EP2389577 A1 EP 2389577A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sample
- light beam
- support
- head
- reading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6452—Individual samples arranged in a regular 2D-array, e.g. multiwell plates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/00029—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor provided with flat sample substrates, e.g. slides
- G01N35/00069—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor provided with flat sample substrates, e.g. slides whereby the sample substrate is of the bio-disk type, i.e. having the format of an optical disk
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/10—Scanning
Definitions
- the field of the invention is that of scanning imaging. More specifically, the invention relates to imaging by scanning a surface of a sample, such as a biological sample, and in particular, but not exclusively, a fluorescently labeled sample.
- the invention can find applications in many fields such as, for example, the food industry, cosmetics, pharmaceuticals, the environment, polymer chemistry, surface control of materials.
- Quality controls are thus implemented during the slaughter of animals, for example in the pig industry, to detect carcasses likely to pose public health problems.
- fluorescence technique consists of mixing (or labeling) a biological sample coupled with an antibody with a fluorescent reagent (called fluorochrome or fluorophore), that is to say, giving it the ability to emit fluorescent light under the fluorescent light. action of a luminous radiation. Fluorescence labeling is known to those skilled in the art and will not be discussed in detail.
- a scanning or fluorescence reading device uses a confocal microscope which subjects the fluorescent reagent labeled biological sample to a light excitation (from a laser source conventionally) and a scanning system. in general oscillating mirrors, which allows to successively position the focusing point of the light beam at different points of the biological sample.
- a fluorescence measurement sensor detects the fluorescence emitted by the biological sample in response to the excitation light.
- the intensity of the fluorescence detected is converted into electrical signals which can then be subjected to a suitable computer processing to obtain a 2D and / or 3D image of the biological sample and to obtain a logically relevant biological information. It is necessary in such a fluorescence reading device to ensure that each scanned point on the surface of the biological sample is placed in the focal plane of the light beam, despite the irregularities of the surface of the biological sample. In other words, the focal point of the confocal microscope must be continuously adjusted during scanning in order to follow the thickness variations of the biological sample.
- the autofocus means are however sensitive to the support material of the biological sample.
- the autofocus means may be "dazzled" by the reflection of the excitation laser and, therefore, may not function properly.
- the scanning system of such a device further requires that the objective of the confocal microscope and the support of the slide carrying the biological sample are mobile, which is relatively complex and expensive to implement.
- a rotary support for example a CD disk, on the surface of which are arranged two concentric zones, namely a data storage zone located towards the center of the disk, and a blade receiving zone. marked by a fluorescent substance, located on the outside of the disc.
- the fluorescence imaging of the blades requires the rotation of the disk by a drive system and the implementation of high precision servo autofocus means which are, by nature, relatively expensive.
- the invention aims in particular to overcome at least some of these various disadvantages of the state of the art.
- an object of the present invention in at least one embodiment, to provide an imaging system of a surface of at least one sample, and in particular, but not exclusively, of fluorescence imaging of a surface of at least one biological sample, which is relatively simple and inexpensive to manufacture.
- the invention aims to provide, in at least one embodiment, a system that reliably and quickly detect the presence of bacteria and / or microorganisms in biological samples.
- a complementary objective of the invention in at least one embodiment, is to provide a system: which allows a high sample analysis rate; which has a resolution of the order of 1 micron (micrometer); which allows a fast acquisition of the fluorescence; - which is compact, possibly portable, and easy to use; and / or which allows the detection of point elements (of micrometric size) sporadically distributed on a sample.
- an imaging system by scanning a surface of at least one sample comprising: a suitable support to be rotated about an axis, comprising: a data storage area; and - at least one receiving housing of a sample; a reading device comprising a first read head of data stored in said storage area, comprising first means for adjusting a first light beam.
- the reading device further comprises: a second detection / measurement head of the light emitted by the sample under the action of a second excitation light beam, and second adjustment means of the second excitation light beam, controlled by a control signal of the first adjustment means of the first light beam of the first read head.
- the invention proposes a scanning-imaging system of a surface of a sample, fluorescently labeled for example, which can be produced from a conventional CD or DVD player, accessible at low cost, and which initially comprises a laser reading head and rotating drive means of a conventional CD or DVD disc.
- the optical precision of such a CD / DVD reader is compatible with the intended applications, in particular, but not exclusively, fluorescence imaging of a surface of at least one biological sample, labeled with a fluorescent substance. , in order to detect the possible presence of predetermined bacteria, sporadically distributed in these samples.
- slides each supporting a biological sample are disposed on an area of an optical disk (CD or DVD for example) as described above also comprising a data storage area.
- the invention proposes to add to the original laser reading head of the CD / DVD reader, which preferably is not modified, a second fluorescence measurement head which is integral with the laser reading head, the two heads can be translated by the same motor when the optical disk carrying the blades to be analyzed is rotated.
- the scanning of the surface of the samples is mixed, that is to say that the CD / DVD disc rotates while the laser reading head, which reads the data stored on the CD / DVD disc, and the head Fluorescence measurement, which sweeps the surface of the samples arranged on the CD / DVD disc, are translated.
- the fluorescence measuring head may, initially, be identical to the laser reading head, and in this case needs to be modified in order to obtain the desired laser excitation. It is also necessary to integrate fluorescence detection means.
- the fluorescence measurement head comprises focusing actuators which make it possible to place the surface of a sample in the focal plane of the excitation light beam. These actuators allow the displacement of the focal point of the measuring head of the fluorescence laterally (parallel to the disc surface) and along the focal axis (perpendicularly to the surface of the disc).
- the focus control signals (servo-control signals) of the laser reading head are duplicated, and possibly adjusted, to control the focusing actuators of the fluorescence measuring head and thus adapt the point of contact. focus to deformations (eg warping, ripples, etc.) and disc surface irregularities
- the lateral servocontrol signals of the laser reading head are duplicated towards the fluorescence measurement head, to ensure identical lateral pointing of the two optics.
- the system of the invention makes it possible to dispense with the expensive autofocus means of the prior art, while proposing a resolution of the order of 1 ⁇ m (micrometer).
- the system of the invention is inexpensive to implement since it is manufactured from an existing device, accessible at low cost, and whose resolution is compatible with the applications envisaged.
- the system of the invention allows the detection of point elements (of micrometric size in the case of bacteria), sporadically distributed and has a satisfactory level of sensitivity without generating significant playback time.
- Such a system is particularly suitable for counting bacteria which requires only a relatively weak dynamic.
- Such a system also allows the simultaneous detection of several bacteria. This simultaneous analysis can be adapted to the sector concerned according to the established or emerging pathogen that one wishes to control.
- This system makes it possible, when used for the detection of bacteria on animal carcasses, to decide on a threshold of contamination in order to decide on the mode of diffusion (fresh or cooked meat) towards the consumer of animal meat.
- the system of the invention allows a gain in quality of the products from which the samples are derived.
- the first read head comprises: means for generating the first reading light beam, first optical means determining a first focusing point of said first reading light beam, and first adjustment means of the first focusing point; and the second detection / measurement head comprises: means for generating the second excitation light beam of said sample; second optical means determining a second focusing point of said second excitation light beam; means for detecting the light emitted by the sample in response to the light excitation, means for converting the detected light into electrical signals representative of an image of the surface of said at least one sample; and second adjustment means of the second focus point.
- the first and second adjustment means make it possible to adjust the position of the first and second focal points respectively along the focal axis of the first and second optical means respectively.
- the first and second adjustment means also make it possible to adjust the position of the first and second focus points respectively in a direction substantially perpendicular to the focal axis of the first and second optical means, respectively.
- the invention is based on the duplication of the lateral and focusing signals of the actuators of the laser reading head of the storage medium, towards a measuring head (or reading) of the fluorescence of the sample or samples.
- the first reading head and the second measuring head are mounted on a common support movable in translation in a direction substantially perpendicular to the axis of rotation of the support when the support is driven in. rotation.
- a calibrated thickness film is disposed on the upper surface of the support so as to crush the sample in the housing to a known thickness relative to the lower surface of the support.
- the second detection / measurement head is able to detect / measure the fluorescence emitted by at least a sample labeled with a fluorescent preparation in response to an excitation light beam.
- the imaging system of the invention can be implemented to scan the surface of a biological sample labeled with a fluorescent preparation (fluorophore).
- control signal of the first adjustment means of the first light beam of the first read head takes account of at least one piece of information representative of at least one type of support defect. , such as variations in thickness, stored in the storage area of the support. Alternatively, or in addition, this information representative of at least one type of support defect can be measured by means of a distance measuring system placed on the second read head.
- the invention also relates to a carrier to be rotated about an axis to be read by a scanning imaging system as previously described, comprising: a data storage and guidance area; and at least one receiving and reading housing of a sample.
- the data stored in the corresponding zone comprise data characterizing the sample.
- data stored in the data storage area includes information representative of at least one type of support defect, such as thickness variations.
- This information can be read by the read head and transmitted to the measuring head of the fluorescence. They can then be used to adapt the autofocus of the fluorescence measurement head.
- the housing receiving a sample comprises at least one expansion port.
- an orifice or expansion zone may be provided in the sample receiving housing to allow extrusion of excess fluorescent preparation when it is crushed to a known thickness defined by the thick film. calibrated for example.
- the invention further relates to a device for reading a medium as described above implemented in a system as described above.
- FIG. 1 shows a view of a blade holder according to one embodiment of the invention ;
- Figure 2 shows a sectional view of the blade holder of Figure 1;
- FIG. 3 represents a device for fluorescence imaging of slides according to one embodiment of the invention;
- FIG. 4 represents the fluorescence measurement head of the device of FIG. 3 according to one embodiment of the invention;
- FIG. 5 represents a bottom view, in perspective, of the fluorescence measuring head according to one embodiment of the invention;
- FIG. 6 represents a view from above, in perspective, of the measurement head of the fluorescence of FIG. 5.
- the general principle of the invention proposes a scanning imaging system, for example fluorescence, of a surface of at least one sample that can be produced from a conventional CD or DVD player accessible at low cost. and which originally comprises a laser reading head and means for rotating a conventional CD or DVD disc.
- the invention is based on the duplication of the lateral and focusing signals of the actuators of the laser reading head of the storage medium, towards a measuring head (or reading) of the fluorescence of the sample or samples, the two heads being mechanically linked . It should be noted that the scanning imaging technique of the invention does not use a confocal microscope.
- the embodiment of the invention described hereinafter is intended to obtain an image of at least one biological sample, which is in the form of a malleable gel, and to detect in this sample the sporadic presence of microbial bacteria. a size close to 1 ⁇ m (micrometer). 6.1 Blade holder
- Figure 1 illustrates a circular support of blades according to one embodiment of the invention.
- the medium is an optical disc 1, for example a CD ("Compact Disc” (registered trademark)) or a DVD (“Digital Versatile Disc” (registered trademark)), generally consisting of polycarbonate.
- CD Compact Disc
- DVD Digital Versatile Disc
- the disc 1 comprises at its center a circular orifice 2, allowing its insertion on a drive device in rotation of the disc 1.
- the upper surface Sl of the disk 1 is divided into two concentric zones: a data recording zone 3 for reading and / or writing data which is situated towards the center of the disk 1, and a reception zone 4 at least one slide bearing a biological sample (not shown), which is located at the periphery of the disc 1.
- blades 5 can be removably placed in cavities 8 (see FIG. 2) of disc 1 which are located in the receiving zone 4. These blades 5 are, for example, retained in the cavities 8 by flexible tongues (not shown).
- the blades 5 can be stainless steel (type AISI 304) or polycarbonate, and can optionally be covered with aluminum foil to overcome the difficulties associated with too much high transparency of the blade.
- FIG. 2 which is a sectional view of the disk 1, distinguishes the fluorescent preparation layer 6 deposited on the biological sample of the plate 5 and a metallization layer 7 deposited on the data recording zone 3 of the disk 1.
- the combined thickness of the fluorescent preparation layer 6 and the plate 5 on which the sample is deposited may be greater than the depth of the cavity 8.
- a film of calibrated thickness (of the order of few microns) can be deposited on the partially metallized disk 1.
- This calibrated thickness film (not shown) comprises, for example, apertures (in other words, the film is perforated in places) intended to almost completely discover the sample plate and makes it possible to crush the fluorescent preparation 6 to a known thickness (the calibrated thickness film therefore has openings inside or at least at the edges of which the crushed preparation adopts the same thickness as the film), depending on the desired depth of field, against the lower surface S2 of the disk 1, and avoids problems due to the depth of field.
- Orifices or expansion zones may be provided in the cavities 8, to allow extrusion of the excess fluorescent preparation 6 when it is crushed by the compression surface of the perforated film.
- the compression surface is for example retained on the disc 1 by holding lugs 10, as shown in FIG. 1.
- Another solution consists in producing a gel of known thickness, the biological sample in this example being in the form of form of a gel malleable. To do this, we have in the gel beads of calibrated diameter of a few micrometers, non-deformable and transparent, non-fluorescent material. The "gel" of the sample is compressed until the compression surfaces come into contact with the non-deformable balls. In each case, zones of expansion of the gel must be provided.
- the reference 11 and the metallization 7 have a common surface that serves as a reference surface.
- the surface lying in the extension of the metallized deposit 7 constituting the readable surface of the CD will preferably be used as a reference surface. In the case of a DVD, it is an accessible surface parallel to the extension of the reading metallization.
- the metallization furthermore conventionally comprises the recording of all the guide-synchronization signals of the CD / DVD 1, as well as any data that may be used in the context of the invention, as described hereinafter.
- Figure 3 shows schematically the disk 1 described above, when inserted into a CD / DVD player modified according to the invention.
- the disc 1 can be rotated about an axis A by a CD / DVD drive motor at constant or variable speed.
- the modified CD / DVD player according to the invention comprises a first reading head 20 and a second fluorescence measuring head 30 which are housed in a fixed frame 43 situated above the disk 1, and which are integral.
- the two heads 20, 30 can move radially (direction referenced "X” in Figure 3) and vertically (direction referenced "Z” in Figure 2) relative to the disk 1.
- the reading head 20 comprises, in a conventional manner, a laser diode able to emit a light beam, an optical system comprising at least one mirror or focusing lens of the light beam emitted on the data zone 3 of the disk 1, and a photoelectric diode adapted to detect the signal reflected by the surface of the data area 3 in response to the light excitation.
- the signals detected by the photo diode can be processed by means of treatment, referenced " ⁇ P" in Figure 4.
- the light beam 9 coming from the read head 20 of the disk 1 and the light beam 10 coming from the fluorescence measurement head 30 (for the analysis of the slides) are represented in FIG. 2.
- the fluorescence signal emitted by the biological sample in response to the light excitation 10 and the signal reflected by the surface of the data area 3, on the other hand, have not been shown.
- the surface of the biological samples of the slides 5 is scanned point by point by the light beam 10 coming from the measuring head of the fluorescence 30 by rotating the disk 1 and by translation of the two heads 20, 30.
- the fluorescence measuring head 30 comprises a light excitation source, which may be a laser diode or an LED, for example, emitting a light beam 10 of the milliwatts (mW) fraction within a few minutes. milliwatts of power (preferably adjustable according to the speed of rotation of the disk 1) at a wavelength corresponding to the excitation of the fluorophores typically used (in this case of the order of 488 nm).
- a light excitation source which may be a laser diode or an LED, for example, emitting a light beam 10 of the milliwatts (mW) fraction within a few minutes. milliwatts of power (preferably adjustable according to the speed of rotation of the disk 1) at a wavelength corresponding to the excitation of the fluorophores typically used (in this case of the order of 488 nm).
- the measuring head of the fluorescence 30 further comprises an optics comprising at least one focusing lens (referenced 15 in FIG. 4) of the emitted light beam and means for detecting the fluorescence emitted by the plates 5 (referenced 32 on the FIG. 4), in a narrow band of wavelengths, in response to the light excitation 10.
- These detection means may comprise one or more sensors (of the photomultiplier, photodiode, CDD or CMOS type) capable of generating an electrical signal depending on the amount of fluorescence detected.
- the signals generated during the scanning of the biological samples placed on the slides 5 by the fluorescence measurement head 30 can be processed by processing means (referenced " ⁇ P" in the figure 4) to obtain an image of the surface of the samples, and to detect the possible presence of bacteria in these samples.
- the size (or diameter) of the spot (or “spot” in English) of the light beam 10 on the surface of the biological samples is preferably controlled to ensure the desired resolution of the area to be scanned.
- the intensity of the light beam 10 can be adjusted according to the response to excitation, to increase the signal-to-noise ratio. A compromise is also necessary between the wavelength, the surface of the spot and the depth of field.
- the system of the invention therefore takes into account the predictable variations in height (in the Z direction) between the focusing point 21 of the read head 20 on the data recording zone 3 of the disk 1 and the focusing point. 31 of the fluorescence measuring head 30 on the surface of the biological samples, as shown in FIG. 2. Due to the rigidity of the material (polycarbonate in this example) of the disk 1, the irregularities of the surface Sl of the disk 1 , which may be due to a curvature of the disk 1, are assumed to be identical, or at least predictable, over the entire radius of the disk 1, from a measurement taken at the location of the read head 20.
- an autofocus command (called autofocus complement) may be applied to the fluorescence measurement head 30 to compensate for these irregularities.
- This control can be performed by slaving by means of piezoelectric shims the position of the fiber carrying the excitation light power in the Z direction. A static adjustment of the position of the fiber carrying the excitation light power along the X and / or Y can also be performed.
- This autofocus complement can be made confocal on the excitation fiber.
- the autofocus correction calculated by the read head 20 of the disk 1 to compensate for the irregularities of the surface Sl also serves to compensate for the same irregularities for the reading of the fluorescence.
- Signals autofocusing the read head 20 are thus directed as such (arrow 60 of Figure 2) to the measuring head of the fluorescence 30, so that the depth of field of the measuring head of the fluorescence 30 ' It does not have to be controlled.
- the flatness defects of the upper surface Sl of the disk 1 are compensated by duplicating the autofocus control signals (focusing signals) of the read head 20 on the measuring head of the fluorescence 30, after having possibly amplified them.
- the lateral servo signals of the read head 20 are duplicated (arrow 60) towards the measurement head of the fluorescence 30, to also ensure identical lateral pointing of the two optics (we will speak here of the first autofocus stage).
- the movement of the two heads 20, 30 being made in step-by-step, the linearization of the movement of the heads 20, 30 is obtained by radial control of the respective focusing lenses of the reading and measuring heads 30.
- the data area 3 and the sample support area 4 are referenced with respect to the lower surface S2 of the disk 1 which is assumed to be flat or which exhibits pitch variations of low spatial frequency.
- FIG. 4 schematically illustrates an embodiment of the fluorescence measurement head 30.
- the light beam 10 emitted by the laser source 16 of the fluorescence measurement head 30 can be conveyed by an optical fiber Fb to a focusing lens 15 which concentrates the light beam 10 in the form of a "spot" 31 on the surface of the biological sample (not shown) disposed on the plate 5.
- the fluorescence 32 emitted by the biological sample in response to the light excitation 10 can be collected via this same lens 15, by a set of optical fibers Fa, and then routed to a system comprising one or more filters 17 and a detector 18 of photomultiplier type (PMT) for example.
- PMT photomultiplier type
- Such a photomultiplier is capable of generate electrical signals depending on the amount of fluorescence detected.
- FIG 5 is a bottom view, in perspective, of the measuring head of the fluorescence 30 according to a particular embodiment.
- This figure shows the original support plate 100 of a laser reading head on which the focusing lens 15 is mounted.
- a cable Fa + Fb comprising the optical fibers Fa and Fb is removably mounted on this support plate.
- Figure 6 shows this same fluorescence measurement head 30 when viewed from above.
- the optical fiber cable Fa + Fb is held on the support plate 100 by a plurality of fixing elements 112 such as screws, the cable being held in position by four centering elements 1 10 and a resilient seal 111.
- an additional autofocus (which will also be called the second autofocus stage) can be applied to the head of the fluorescence measurement head 30.
- This complement can be performed by slaving by means of piezoelectric shims arranged in housings 120, the position of the fiber carrying the excitation light power in the Z direction.
- a static adjustment of the position of the fiber conveying the excitation light power along the X and / or Y directions can also be carried out .
- the X, Y and Z autofocus signals of the read head 20 are duplicated (arrow 60) towards the measurement head of the fluorescence 30.
- These autofocus signals are applied to the conventional focusing actuators (FIG. not shown) of the fluorescence measuring head 30, which comprise at least the focusing lens 15, and which allow the displacement of the measuring head of the fluorescence 30 in the X, Y and / or Z directions.
- the metallization layer 7 deposited on the data recording zone 3 of the disk 1 may constitute a reference surface, as well as monitoring the "spiral" information, for the enslavement of the focusing optics. This is achieved with a simple continuous CD playback (no range jump, regardless of the type of information).
- Seizure information may be etched on the area 3 of the disk 1, to identify the set of blades attached thereto.
- Information characterizing the analysis of the blades arranged on the disk can also be engraved on the zone 3. It will thus be possible to store on the disk the date and time of the analysis, the result of the analysis (positive when bacteria are detected or negative if not), etc. Similarly, it is envisaged to pre-characterize the disks under laboratory conditions (no misalignment under these conditions), during the manufacture of the disk for example, and to store in the data zone 3 information representative of certain types. non-evolutive defects (variation of thickness of the optical disk for example). This pre-characterization phase of the disk, for example its optical thickness at the level of the fluorescence reading head, can be performed by Fizeau type interferometry. This information is read by the read head 20 and transmitted to the measuring head of the fluorescence 30.
- This compensation can be s' by modifying the focusing signal (first autofocus stage), and / or for example by means of the aforementioned piezoelectric shims (second autofocus stage).
- the system of the invention makes it possible to detect and to count the microorganisms in biological samples in short time, of the order of 3 or 4 hours, for example, and to draw information on the contamination of an animal carcass.
- the system of the invention can be used to scan a sample in depth (according to Z) and thus obtain a 3D image of the sample. Such scanning however requires modulating the focusing signal and / or using slower disk rotation speeds and / or making several successive confocal passes, by varying the focusing of the light beam.
- Such a system can be implemented in parallel with an automatic system for taking biological samples by impaction, fluorescence-labeled samples and archival sample support slides.
- Such a system can be used by industrial and food risk control organizations, and is an alternative to control methods based on animal serology or bacteriological.
- the industrialist or the control body using the system of the invention thus has a tool for packaging the meat, or any other food product, according to the information representative of the contamination obtained, without slowing down the process. slaughter or processing.
- the principle of the invention also significantly reduces the manufacturing cost of fluorescence imaging devices, such as those used for the analysis of biological samples.
- the system of the invention can also allow the imaging of chips of biological samples ("biochips" in English) even if the reading of such chips does not require a resolution as high as for slides.
- the invention can be implemented for the biological analysis of industrial and consumer products (perishable and non-perishable), in particular in the field of human and animal health.
- the invention can find applications in many fields such as, for example, agribusiness (poultry industry, pigs, etc.), cosmetics, pharmaceuticals, the environment, polymer chemistry (analysis of plastics) , surface control of materials, etc. More generally, the invention can also be implemented for the analysis of any flat sample, in direct lighting and reflection imaging. diffusion.
- the angle of incidence of the light beams coming from the reading and measuring heads of the fluorescence is zero.
- the collection must be sufficient, which limits to rather low angles; in the case of confocal detection, the flux may decrease with the angle; - the optical geometry of the original reading head must be respected.
- the scanning and autofocus system of the invention is not dependent on the reading mode of the sample.
- the reading of the sample can be performed by any type of excitation light source or illumination: incoherent illumination (no fluorescence analysis possible in this case, and preferably in confocal or back-diffusion), confocal (in reflection as in fluorescence), by transmission (this requires for example a movable collector on the other side of the disc which follows the transverse movement of the heads 20 and 30), by reflection, etc.
- incoherent illumination no fluorescence analysis possible in this case, and preferably in confocal or back-diffusion
- confocal in reflection as in fluorescence
- transmission this requires for example a movable collector on the other side of the disc which follows the transverse movement of the heads 20 and 30
- reflection etc.
- optical fibers multicore fibers, hole fibers, etc.
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- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0900307 | 2009-01-23 | ||
| PCT/EP2010/050808 WO2010084193A1 (fr) | 2009-01-23 | 2010-01-25 | Systeme d'imagerie par balayage d'une surface d'un echantillon, support et dispositif de lecture correspondants |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2389577A1 true EP2389577A1 (fr) | 2011-11-30 |
| EP2389577B1 EP2389577B1 (fr) | 2020-03-18 |
Family
ID=41693153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10701665.1A Not-in-force EP2389577B1 (fr) | 2009-01-23 | 2010-01-25 | Systeme d'imagerie par balayage d'une surface d'un echantillon et dispositif de lecture correspondant |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2389577B1 (fr) |
| WO (1) | WO2010084193A1 (fr) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020177144A1 (en) * | 1997-12-30 | 2002-11-28 | Jose Remacle | Detection and/or quantification method of a target molecule by a binding with a capture molecule fixed on the surface of a disc |
-
2010
- 2010-01-25 WO PCT/EP2010/050808 patent/WO2010084193A1/fr not_active Ceased
- 2010-01-25 EP EP10701665.1A patent/EP2389577B1/fr not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010084193A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2389577B1 (fr) | 2020-03-18 |
| WO2010084193A1 (fr) | 2010-07-29 |
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